An ornamental design or carving that is incised or engraved into a surface, creating an intaglio effect.
From Greek 'dia-' (through) and 'glyphein' (to carve or engrave), literally meaning 'carved through.'
Ancient seals and cylinders used diaglyphs—when rolled or pressed into clay, the carved design created a raised impression, which is the opposite of how it was cut!
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